A worm discovered in 1977 changed biology
forever. They grow up to 7 feet long without any obvious sources of light of
food in their deep sea habitat. These worms survive through a process called
chemosynthesis. The absorb hydrogen sulfide from ocean floor vents and bacteria
within the worm consume the chemical to create carbon compounds to feed the
worm.
http://www.npr.org/2011/12/05/142678239/the-deep-sea-find-that-changed-biology
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